A tractor trailer crash has closed Interstate 79 North in Jackson Township for several hours. The accident occurred at 11:25 a.m., and the highway is expected to be closed until 1:30 p.m., according to the state Department of Transportation. I-79 North is closed between Exit 83, which is State Road 528, Evans City, and Exit 87, which is State Road 68, Zelienople. Traffic is being transferred off I-79 North at Exit 83 to State Road 19.